An inductive charging circuit coupled to a winding of a power converter and a supply terminal of a controller of the power converter. The inductive charging circuit comprising an input coupled to the winding, the input coupled to receive a switching voltage generated by the power converter, an inductor coupled to the input to provide an inductor current in response to the switching voltage, a first diode coupled to the inductor to enable the inductor current to flow from the input of the inductive charging circuit to an output of the inductive charging circuit; and the output of the inductive charging circuit coupled to the supply terminal of the controller, the output of the inductive charging circuit configured to provide an operational current responsive to the switching voltage, the controller is configured to control a power switch of the power converter to generate the switching voltage.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The inductive charging circuit of claim 1, wherein the winding of the power converter is an output winding on an output side of the power converter, the switching voltage is an output winding voltage generated by the turn on and turn off of the power switch of the power converter, and the controller is a second controller coupled to the output side of the power converter.
3. The inductive charging circuit of claim 2, wherein the input of the inductive charging circuit is coupled between the output winding and an output rectifier of the power converter.
4. The inductive charging circuit of claim 3, wherein the inductor is coupled between the output winding and the output rectifier of the power converter.
6. The inductive charging circuit of claim 5, wherein a capacitance of the capacitor is selected such that a resonance frequency of the capacitor and the inductor is less than a switching frequency of the power switch of the power converter.
7. The inductive charging circuit of claim 1, wherein the output of the inductive charging circuit is coupled to a bypass capacitor that is coupled to filter the operational current provided by the inductive charging circuit.
8. The inductive charging circuit of claim 1, wherein the winding of the power converter is a bias winding on an input side of the power converter, the switching voltage is a bias winding voltage generated by the turn on and turn off of the power switch of the power converter, and the controller is a first controller coupled to the input side of the power converter.
9. The inductive charging circuit of claim 8, wherein the input of the inductive charging circuit is coupled between the bias winding and an input of a regulator.
11. The power converter of claim 10, wherein the input of the inductive charging circuit is coupled between the output winding and the output rectifier.
12. The power converter of claim 11, wherein the inductor is coupled between the output winding and the output rectifier of the power converter.
14. The power converter of claim 13, wherein a capacitance of the capacitor is selected such that a resonance frequency of the capacitor and the inductor is less than a switching frequency of the power switch.
15. The power converter of claim 10, further comprising a communication link between the second controller and the first controller, wherein the communication link provides galvanic isolation between the first controller and the second controller and is formed from a leadframe.
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December 7, 2021
January 24, 2023
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